CN220510976U - Auxiliary power supply starting circuit, chip and electronic equipment - Google Patents
Auxiliary power supply starting circuit, chip and electronic equipment Download PDFInfo
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- CN220510976U CN220510976U CN202321313519.6U CN202321313519U CN220510976U CN 220510976 U CN220510976 U CN 220510976U CN 202321313519 U CN202321313519 U CN 202321313519U CN 220510976 U CN220510976 U CN 220510976U
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- 208000031361 Hiccup Diseases 0.000 description 1
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Abstract
The utility model provides an auxiliary power supply starting circuit, a chip and electronic equipment, wherein the auxiliary power supply starting circuit comprises: the power supply comprises a voltage stabilizing driving circuit, a starting circuit, a control chip, an auxiliary power supply self-powered circuit, a starting control circuit and an auxiliary power supply; the auxiliary power supply self-powered circuit and the auxiliary power supply are electrically connected to the control chip, and the auxiliary power supply and the starting control circuit are electrically connected with the auxiliary power supply self-powered circuit; the starting circuit comprises a resistor and at least one switching device, and the resistor is electrically connected with the switching device. By implementing the utility model, the auxiliary power supply can adopt a smaller starting resistor and turn off the starting circuit after the auxiliary power supply is started, so that the starting of the auxiliary power supply can be accelerated and the circuit loss can be effectively reduced.
Description
Technical Field
The present utility model relates to the field of switching power supply technologies, and in particular, to an auxiliary power supply starting circuit, a chip, and an electronic device.
Background
At present, auxiliary power supply starting circuits of a plurality of switch power supplies are hung on a direct current bus through resistors to provide starting current for a control chip, and after the auxiliary power supplies are started, the resistors are hung on the bus all the time. If the value of the starting resistor is too large, the auxiliary source is started slowly, and when the direct current bus is low, the auxiliary source is hiccup and is started frequently; if the value of the starting resistor is smaller, the auxiliary source starting time can be shortened, but the starting resistor is always hung on the bus, so that larger loss can be generated when the direct current bus is higher; if the value of the starting capacitor is smaller, the auxiliary source starting time can be shortened, but when the direct current bus is lower, the starting capacitor is difficult to maintain the IC to work to the secondary side to establish normal output voltage. Therefore, the existing auxiliary source starting circuit has large circuit loss of the direct current bus.
Disclosure of Invention
The utility model provides an auxiliary power supply starting circuit, a chip and electronic equipment, and aims to solve the problem that a starting resistor is continuously hung on a direct current bus to generate larger loss in the related art.
In order to solve the above technical problem, a first aspect of the present utility model provides an auxiliary power supply starting circuit, which is characterized by comprising: the power supply comprises a voltage stabilizing driving circuit, a starting circuit, a control chip, an auxiliary power supply self-powered circuit, a starting control circuit and an auxiliary power supply;
the voltage stabilizing driving circuit, the control chip and the starting control circuit are all electrically connected with the starting circuit, the auxiliary power supply self-powered circuit and the auxiliary power supply are all electrically connected with the control chip, and the auxiliary power supply and the starting control circuit are all electrically connected with the auxiliary power supply self-powered circuit;
the start-up circuit comprises a first resistor and at least one first switching device, the first switching device comprising any one of: the MOS tube, triode and IGBT tube, the first resistor is electrically connected with the first switch device.
Further, the voltage stabilizing driving circuit includes: a second resistor and a first zener diode; one end of the second resistor is electrically connected with the direct current bus, and the other end of the second resistor is electrically connected with the cathode of the first zener diode; the positive electrode of the first zener diode is grounded.
Further, one end of the first resistor is electrically connected with one end of the second resistor, and the other end of the first resistor is electrically connected with the first end of the first switching device; the second end of the first switch device is electrically connected with the common connection end of the second resistor and the first zener diode, and the third end of the first switch device is electrically connected with the power end of the control chip.
Further, the auxiliary power supply starting circuit further includes: a capacitor; one end of the capacitor is electrically connected to the common connection end of the starting circuit and the control chip, and the other end of the capacitor is electrically connected with the starting control circuit.
Further, the auxiliary power supply self-powered circuit comprises a diode and a transformer; the negative electrode of the diode is electrically connected with the public connecting end of the starting circuit and the control chip, and the positive electrode of the diode is electrically connected with one end of the transformer; the other end of the transformer is electrically connected with the other end of the capacitor and the auxiliary power supply.
Further, the start control circuit includes: a voltage detection circuit and a drive lockout circuit, the drive lockout circuit including at least one second switching device, the second switching device including any one of: MOS tube, triode and IGBT tube; the first end of the driving locking circuit is electrically connected to the common connection end of the voltage stabilizing driving circuit and the starting circuit, the second end of the driving locking circuit is electrically connected with the voltage detection circuit, and the third end of the driving locking circuit is electrically connected with the positive electrode of the first voltage stabilizing diode.
Further, the voltage detection circuit includes: a second zener diode and a third resistor; the negative electrode of the second voltage stabilizing diode is electrically connected with the public connecting end of the starting circuit and the control chip, and the positive electrode of the second voltage stabilizing diode is electrically connected with one end of the third resistor; the other end of the third resistor is electrically connected with the third end of the driving locking circuit; the second end of the driving locking circuit is electrically connected to one end of the third resistor.
Further, the auxiliary power supply starting circuit further includes: a direct current voltage source; one end of the direct-current voltage source is electrically connected with the direct-current bus, and the other end of the direct-current voltage source is electrically connected with the auxiliary power supply and grounded.
The second aspect of the utility model provides an auxiliary power supply starting chip, which comprises the auxiliary power supply starting circuit according to the first aspect of the utility model.
A third aspect of the utility model provides an electronic device comprising an auxiliary power supply start-up circuit as described in the first aspect of the utility model or an auxiliary power supply start-up chip as described in the second aspect of the utility model.
As can be seen from the above description, the present utility model has the following advantageous effects compared with the related art:
the auxiliary power supply self-powered circuit can provide stable working voltage for the control chip after the auxiliary power supply is started, and when the working voltage of the control chip exceeds a voltage threshold value, the starting circuit is regulated to close the starting circuit through the starting control circuit, so that the starting of the auxiliary power supply can be accelerated and the circuit loss is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of a basic circuit for auxiliary power supply startup according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an auxiliary power supply starting circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of another auxiliary power supply startup circuit according to an embodiment of the present utility model;
fig. 4 is a schematic diagram of an implementation circuit of an auxiliary power supply starting circuit according to an embodiment of the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
In the related art, there is a problem that a starting resistor is continuously hung on a direct current bus to generate a large loss. Therefore, the embodiment of the utility model provides an auxiliary power supply starting circuit.
Referring to fig. 1, an auxiliary power supply starting circuit provided in an embodiment of the utility model includes: the power supply comprises a voltage stabilizing driving circuit 100, a starting circuit 200, a control chip 300, an auxiliary power supply self-power supply circuit 400, a starting control circuit 500 and an auxiliary power supply 600.
Specifically, the voltage stabilizing driving circuit 100, the control chip 300 and the start control circuit 500 are all electrically connected with the start circuit 200, the auxiliary power supply self-powered circuit 400 and the auxiliary power supply 600 are all electrically connected with the control chip 300, and the auxiliary power supply 600 and the start control circuit 500 are all electrically connected with the auxiliary power supply self-powered circuit 400; the start-up circuit comprises a first resistor 210 and at least one first switching device 220, the first switching device 220 comprising any of the following: MOS tube, triode and IGBT tube; the first resistor 210 is electrically connected to the first switching device 220.
In this embodiment, after the voltage-stabilizing driving circuit provides the driving voltage for the starting circuit, the starting circuit may provide the starting current for the control chip, and meanwhile, the gate-source voltage of the first switching tube is protected from exceeding the threshold value, so as to control the auxiliary power supply to be turned on.
Referring to fig. 2, the voltage stabilizing driving circuit 100 includes: the second resistor R2 and the first zener diode D1.
Specifically, one end of the second resistor R2 is electrically connected to the dc bus, and the other end is electrically connected to the cathode of the first zener diode D1; the positive pole of the first zener diode D1 is grounded.
In this embodiment, the second resistor R2 and the first voltage regulator tube D1 form a voltage-stabilizing driving circuit to provide a driving voltage for the starting circuit.
Still further, referring to fig. 2, one end of the first resistor R1 is electrically connected to one end of the second resistor R2, and the other end is electrically connected to the first end of the first switching device Q1; the second end of the first switching device Q1 is electrically connected with the common connection end of the second resistor R2 and the first zener diode D1, and the third end is electrically connected with the power end of the control chip.
In this embodiment, the second resistor R2 and the first voltage regulator D1 provide a driving voltage for the switching device, and protect the driving voltage from exceeding a driving voltage threshold of the switching device; in addition, the switching device in this embodiment may be a MOS transistor Q1, a triode, and an IGBT transistor, and the switching device may be one or more switching devices connected in parallel, and in this embodiment, a single N-type MOS transistor is optionally used as the switching device, as shown in fig. 2, a drain electrode of the MOS transistor Q1 is electrically connected to the first resistor R1, a source electrode is electrically connected to the control chip, and a gate electrode is electrically connected to a common connection end of the second resistor R2 and the first zener diode D1. When the MOS tube is conducted, the direct current bus provides starting current for the control chip through the first resistor R1 and the MOS tube Q1. In this embodiment, the resistance of the first resistor R1 is smaller than the resistance of the second resistor R2, and the first resistor R1 is a starting resistor.
Further, referring to fig. 2, the auxiliary power supply starting circuit further includes: a capacitor C1.
Specifically, one end of the capacitor C1 is electrically connected to the common connection end of the start circuit 200 and the control chip, and the other end is electrically connected to the start control circuit 500.
In this embodiment, after the MOS transistor Q1 of the starting circuit 200 is turned on, the dc bus can charge the first capacitor C1 through the first resistor R1 and the MOS transistor Q1, and the value of the first resistor R1 in this embodiment is smaller, so that the first capacitor C1 can be rapidly charged and provide a starting current for the control chip, and can provide a sufficient starting current for the control chip when the voltage of the dc bus is lower. In this embodiment, the control chip model is UC2845.
Still further, referring to fig. 2, the auxiliary power supply self-powered circuit includes a diode D2 and a transformer T; the negative electrode of the diode D2 is electrically connected to the common connection end of the starting circuit 200 and the control chip, and the positive electrode is electrically connected to one end of the transformer T; the other end of the transformer T is electrically connected to the other end of the capacitor C1 and is electrically connected to the auxiliary power supply.
In this embodiment, after the auxiliary power is started, the transformer T can directly obtain energy from the dc bus, and then provide stable working current and working voltage VDD to the control chip.
Further, referring to fig. 2, the start control circuit 500 includes: a voltage detection circuit and a driving lockout circuit, the driving lockout circuit including at least one second switching device Q2, the second switching device Q2 including any one of: MOS pipe, triode, IGBT pipe.
Specifically, the first end of the driving blocking circuit is electrically connected to the common connection end of the voltage stabilizing driving circuit 100 and the starting circuit, the second end is electrically connected to the voltage detecting circuit, and the third end is electrically connected to the positive electrode of the first zener diode D1.
The driving blocking circuit in this embodiment may be formed by connecting one or more switching devices in parallel, where the switching devices may be a MOS transistor, a triode, and an IGBT transistor, and when the triode is used as the second switching device, as shown in fig. 2, the collector of the triode Q2 is electrically connected to the gate of the MOS transistor Q1, the emitter is electrically connected to the anode of the first zener diode D1, and the base is electrically connected to the voltage detection circuit; when the MOS transistor is used as the second switching device, as shown in fig. 3, the drain electrode of the MOS transistor Q2 is electrically connected to the gate electrode of the MOS transistor Q1, the source electrode is electrically connected to the anode of the first zener diode D1, and the gate electrode is electrically connected to the voltage detection circuit.
Still further, referring to fig. 2, the voltage detection circuit includes: the second zener diode D3 and the third resistor R3.
Specifically, the negative electrode of the second zener diode D3 is electrically connected to the common connection end of the starting circuit 200 and the control chip, and the positive electrode is electrically connected to one end of the third resistor R3; the other end of the third resistor R3 is electrically connected with a third end of the driving locking circuit; the second end of the driving blocking circuit is electrically connected to one end of the third resistor R3.
In this embodiment, when the actual working voltage VDD of the control chip exceeds the stable voltage Vzt of the zener diode D3, the voltage detection circuit will drive the transistor Q2, so that the transistor Q2 pulls down the driving voltage of the MOS transistor Q1, thereby turning off the MOS transistor Q1; when the MOS tube Q1 is turned off, an auxiliary power supply starting circuit formed by the starting resistor R1 and the MOS tube Q1 does not work any more, namely, after the auxiliary power supply works, the starting resistor R1 and the MOS tube Q1 have no loss. In one implementation of the present embodiment, as shown in fig. 4, the voltage detection circuit may include resistors R3 and R4, wherein one end of the resistor R3 is electrically connected to the zener diode D3, the other end is electrically connected to one end of the resistor R4, and the other end of the resistor R4 is electrically connected to the emitter of the triode Q2; the driving blocking circuit also comprises a resistor R5, one end of the resistor R5 is connected with the collector electrode of the triode Q2, and the other end of the resistor R5 is connected with the grid electrode of the switching tube Q1; a capacitor C2 is also connected between the driving locking circuit and the voltage detection circuit; the second resistor in the voltage stabilizing driving circuit may be formed by connecting a plurality of resistors in series.
Further, referring to fig. 2, the auxiliary power supply starting circuit further includes: a direct current voltage source DC.
Specifically, one end of the direct current voltage source DC is electrically connected to the direct current bus, and the other end is electrically connected to the auxiliary power source and grounded.
After the voltage-stabilizing driving circuit provides driving voltage for the starting circuit, the first switching device is conducted, so that the direct-current bus provides starting current for the control chip through the starting circuit, the auxiliary power supply is controlled to be started, after the auxiliary power supply is started, the auxiliary power supply self-powered circuit can directly extract energy from the direct-current bus and then provide stable working current and working voltage for the control chip, when the working voltage of the control chip exceeds a voltage threshold value, the starting circuit is regulated by the starting control circuit to be closed, and therefore circuit loss can be effectively reduced; and because the starting resistor has smaller value, the starting capacitor can be charged rapidly, so that enough starting current can be provided for the control chip when the direct current bus is lower, and the starting of the auxiliary power supply is quickened.
The embodiment of the utility model also provides an auxiliary power supply starting chip, which comprises the auxiliary power supply starting circuit.
The embodiment of the utility model also provides electronic equipment which comprises the auxiliary power supply starting circuit or the auxiliary power supply starting chip. The electronic device may be a charging module, an inverter, or the like.
It should be noted that, in the present disclosure, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It should also be noted that in the present disclosure, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An auxiliary power supply start-up circuit, comprising: the power supply comprises a voltage stabilizing driving circuit, a starting circuit, a control chip, an auxiliary power supply self-powered circuit, a starting control circuit and an auxiliary power supply;
the voltage stabilizing driving circuit, the control chip and the starting control circuit are all electrically connected with the starting circuit, the auxiliary power supply self-powered circuit and the auxiliary power supply are all electrically connected with the control chip, and the auxiliary power supply and the starting control circuit are all electrically connected with the auxiliary power supply self-powered circuit;
the start-up circuit comprises a first resistor and at least one first switching device, the first switching device comprising any one of: the MOS tube, triode and IGBT tube, the first resistor is electrically connected with the first switch device.
2. The auxiliary power supply start-up circuit of claim 1, wherein the voltage stabilizing drive circuit comprises: a second resistor and a first zener diode; one end of the second resistor is electrically connected with the direct current bus, and the other end of the second resistor is electrically connected with the cathode of the first zener diode; the positive electrode of the first zener diode is grounded.
3. The auxiliary power supply starting circuit according to claim 2, wherein one end of the first resistor is electrically connected to one end of the second resistor, and the other end is electrically connected to the first end of the first switching device; the second end of the first switch device is electrically connected with the common connection end of the second resistor and the first zener diode, and the third end of the first switch device is electrically connected with the power end of the control chip.
4. The auxiliary power supply starting circuit of claim 1, further comprising: and one end of the capacitor is electrically connected with the common connection end of the starting circuit and the control chip, and the other end of the capacitor is electrically connected with the starting control circuit.
5. The auxiliary power supply startup circuit of claim 4, wherein the auxiliary power supply self-powered circuit comprises a diode and a transformer; the negative electrode of the diode is electrically connected with the public connecting end of the starting circuit and the control chip, and the positive electrode of the diode is electrically connected with one end of the transformer; the other end of the transformer is electrically connected with the other end of the capacitor and the auxiliary power supply.
6. The auxiliary power supply startup circuit according to claim 2, wherein the startup control circuit comprises: a voltage detection circuit and a drive lockout circuit, the drive lockout circuit including at least one second switching device, the second switching device including any one of: MOS tube, triode and IGBT tube; the first end of the driving locking circuit is electrically connected to the common connection end of the voltage stabilizing driving circuit and the starting circuit, the second end of the driving locking circuit is electrically connected with the voltage detection circuit, and the third end of the driving locking circuit is electrically connected with the positive electrode of the first voltage stabilizing diode.
7. The auxiliary power supply startup circuit according to claim 6, wherein the voltage detection circuit comprises: a second zener diode and a third resistor; the negative electrode of the second voltage stabilizing diode is electrically connected with the public connecting end of the starting circuit and the control chip, and the positive electrode of the second voltage stabilizing diode is electrically connected with one end of the third resistor; the other end of the third resistor is electrically connected with the third end of the driving locking circuit; the second end of the driving locking circuit is electrically connected to one end of the third resistor.
8. The auxiliary power supply starting circuit of claim 1, further comprising: a direct current voltage source; one end of the direct-current voltage source is electrically connected with the direct-current bus, and the other end of the direct-current voltage source is electrically connected with the auxiliary power supply and grounded.
9. An auxiliary power supply start-up chip comprising an auxiliary power supply start-up circuit as claimed in any one of claims 1 to 8.
10. An electronic device comprising an auxiliary power supply start-up circuit as claimed in any one of claims 1 to 8 or an auxiliary power supply start-up chip as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321313519.6U CN220510976U (en) | 2023-05-26 | 2023-05-26 | Auxiliary power supply starting circuit, chip and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321313519.6U CN220510976U (en) | 2023-05-26 | 2023-05-26 | Auxiliary power supply starting circuit, chip and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220510976U true CN220510976U (en) | 2024-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321313519.6U Active CN220510976U (en) | 2023-05-26 | 2023-05-26 | Auxiliary power supply starting circuit, chip and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220510976U (en) |
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2023
- 2023-05-26 CN CN202321313519.6U patent/CN220510976U/en active Active
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