Driving power supply circuit and driving system thereof

Abstract

The utility model belongs to the technical field of power supply driving, and particularly relates to a driving power supply circuit and a driving system thereof, the circuit comprises a multi-voltage-multiplying rectifying circuit and a voltage stabilizing circuit connected with the multi-voltage-multiplying rectifying circuit, the multi-voltage-multiplying rectifying circuit comprises a voltage-multiplying rectifying unit, the voltage stabilizing circuit comprises a positive voltage stabilizing circuit, and the positive voltage stabilizing circuit comprises a negative voltage stabilizing circuit. The positive voltage stabilizing circuit comprises a triode and a voltage stabilizing element connected with a base electrode of the triode, a collector electrode of the triode is connected with the voltage-multiplying rectifying unit, the base electrode of the triode is further connected with the voltage-multiplying rectifying circuit, and rectified power supply voltage output by the voltage-multiplying rectifying circuit is higher than rectified power supply voltage output by the voltage-multiplying rectifying unit. When large power is output, the base voltage of the triode is still higher than the emitter voltage of the triode, the triode is completely conducted, the problem that the heating power is large due to the fact that the voltage drop of the triode is high is solved, and the stability and reliability of the circuit are improved; the voltage drop of the triodes is small when large power is output, and the utilization rate of the rectified power voltage output by the voltage doubling rectifying unit can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power drive, in particular to a drive power circuit and a drive system thereof. Background Art

[0002] In power supply design, achieving stable voltage output is a key step in ensuring the performance and reliability of electronic devices. For the voltage regulation requirements of positive and negative voltage sources, the appropriate voltage regulation solution is usually selected based on the specific application scenario, cost, and efficiency requirements.

[0003] The common solution for existing drive power supplies is to use a voltage regulator diode for positive power supply stabilization and leave the negative power supply unstabilized. However, this solution is not suitable for systems requiring high precision. To improve the voltage stabilization accuracy, it is further proposed to use a TL431 component and a transistor for positive power supply stabilization and a voltage regulator diode for negative power supply stabilization to construct a voltage stabilization circuit. However, when the TL431 component is used in conjunction with a transistor in the prior art, the voltage input of the TL431 component and the collector of the transistor are connected together, that is, the input voltage is the same, and the voltage V across the collector-emitter of the transistor cannot be guaranteed. CE To maintain the normal operation of the voltage regulator circuit, the base voltage of the transistor must be higher than the saturation voltage drop of the transistor. There must be enough margin to make the base voltage of the transistor high enough to turn on the transistor. However, this will make the transistor V CE The voltage drop is high, resulting in high heat generation power, affecting the reliability of the voltage stabilization circuit; and the transistor V CE The voltage across the two ends is equal to the saturation voltage drop of the transistor, which may cause the positive voltage output to deviate from the set value, thereby affecting the stability of the voltage stabilization circuit. Utility Model Content

[0004] The utility model provides a driving power supply circuit, which aims to solve the problems in the prior art of high transistor heating power and deviation of the positive voltage output from the set value due to connection of the voltage input of the TL431 component and the collector of the transistor, resulting in low reliability and stability of the voltage stabilization circuit.

[0005] The utility model is implemented as follows: in a first aspect, a driving power supply circuit is provided, comprising a multi-voltage rectifier circuit and a voltage stabilizing circuit connected to the multi-voltage rectifier circuit, wherein the multi-voltage rectifier circuit comprises a voltage-doubling rectifier unit, the voltage stabilizing circuit comprises a positive voltage stabilizing circuit, the positive voltage stabilizing circuit comprises a transistor and a voltage stabilizing element, the collector of the transistor is connected to the output end of the voltage-doubling rectifier unit, the base of the transistor is connected to the output end of the multi-voltage rectifier circuit and the voltage stabilizing element, and the rectifier power supply voltage output by the multi-voltage rectifier circuit is higher than the rectifier power supply voltage output by the voltage-doubling rectifier unit.

[0006] Furthermore, the voltage doubler rectifier unit includes a first capacitor, a second capacitor, a first diode and a second diode; one end of the first capacitor is connected to one end of the input power supply, and the other end of the first capacitor is connected to the cathode of the first diode and the anode of the second diode; the cathode of the second diode is connected to one end of the second capacitor and the collector of the transistor, and the anode of the first diode and the other end of the second capacitor are connected to the other end of the input power supply.

[0007] Furthermore, the multi-voltage rectifier circuit also includes a third capacitor, a fourth capacitor, a third diode and a fourth diode; one end of the third capacitor is connected to the cathode of the first diode and the anode of the second diode, the other end of the third capacitor is connected to the cathode of the third diode and the anode of the fourth diode, and the anode of the third diode is connected to the cathode of the second diode; one end of the fourth capacitor is connected to the cathode of the fourth diode, and the cathode of the fourth diode is connected to the base of the transistor, and the other end of the fourth capacitor is connected to the input power supply.

[0008] Furthermore, the positive voltage stabilization circuit also includes a feedback control circuit and a fifth capacitor, the feedback control circuit is connected between the base and the emitter of the transistor, one end of the fifth capacitor is connected to the emitter of the transistor, the emitter of the transistor is connected to the positive electrode of the output power supply, and the other end of the fifth capacitor is connected to the reference ground.

[0009] Furthermore, the feedback control circuit includes a first resistor, a second resistor, a third resistor and the voltage stabilizing element; one end of the first resistor is connected to the cathode of the fourth diode, and the other end of the first resistor is connected to the base of the transistor; one end of the second resistor is connected to the emitter of the transistor, the other end of the second resistor is connected to one end of the third resistor and the reference end of the voltage stabilizing element, and the other end of the third resistor is connected to the reference ground; the positive electrode of the voltage stabilizing element is connected to the negative voltage stabilizing circuit and the reference ground, and the negative electrode of the voltage stabilizing element is connected to the base of the transistor.

[0010] Furthermore, the voltage stabilizing circuit also includes a negative voltage stabilizing circuit connected to the positive voltage stabilizing circuit, and the negative voltage stabilizing circuit includes a voltage stabilizing diode and a sixth capacitor connected in parallel, the negative pole of the voltage stabilizing diode and one end of the sixth capacitor are connected to the reference ground, and the positive pole of the voltage stabilizing diode and the other end of the sixth capacitor are connected to the negative pole of the output power supply.

[0011] Furthermore, the voltage stabilizing element includes a three-terminal integrated voltage stabilizer.

[0012] Furthermore, the voltage-doubling rectifier unit includes a double-voltage rectifier unit, and the multi-voltage rectifier circuit includes a quadruple-voltage rectifier circuit.

[0013] In a second aspect, a driving system is provided, comprising a switching circuit, a transformer, an isolation driving circuit, a switching tube, and a driving power supply circuit as described in the first aspect; the input end of the switching circuit is connected to an external power supply, the output end of the switching circuit is connected to the input end of the transformer, the output end of the transformer is connected to the input end of the driving power supply circuit, the output end of the driving power supply circuit is connected to the input end of the isolation driving circuit, and the output end of the isolation driving circuit is connected to the switching tube.

[0014] The beneficial effects achieved by the present invention are as follows: by connecting the output end of the multi-voltage rectifier circuit and the voltage stabilizing element to the base of the transistor in the positive voltage stabilizing circuit, and connecting the output end of the voltage-doubling rectifier unit to the collector of the transistor in the positive voltage stabilizing circuit, wherein the rectifier power supply voltage output by the multi-voltage rectifier circuit is higher than the rectifier power supply voltage output by the voltage-doubling rectifier unit, when the multi-voltage rectifier circuit is connected to the input power supply, at a relatively high power output, the base voltage of the transistor can still be higher than the emitter voltage of the transistor, thereby enabling the transistor to be fully turned on, ensuring the positive voltage output set value, and avoiding the problem of high heat generation power caused by a high voltage drop between the collector and emitter of the transistor, thereby improving the stability and reliability of the voltage stabilizing circuit; at the same time, the voltage drop of the transistor is small when a relatively high power is output, which can improve the utilization rate of the rectifier power supply voltage output by the voltage-doubling rectifier unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A circuit diagram of a driving power supply circuit provided in an embodiment of the present utility model;

[0016] Figure 2 A schematic diagram of an actual circuit voltage test result provided by an embodiment of the present utility model;

[0017] Figure 3 This is a structural diagram of a drive system provided in an embodiment of the present utility model.

[0018] Among them, 1. Multi-voltage rectifier circuit, 2. Voltage stabilizing circuit, 3. Voltage doubler rectifier unit, 4. Positive voltage stabilizing circuit, 5. Negative voltage stabilizing circuit, 6. Switching circuit, 7. Transformer, 8. Drive power circuit, 9. Isolation drive circuit, 10. Switching tube. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention 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 only used to explain the present invention and are not intended to limit the present invention.

[0020] The present application connects the output end of the multi-voltage rectifier circuit and the voltage stabilizing element to the base of the transistor in the positive voltage stabilizing circuit, and connects the output end of the voltage doubler rectifier unit to the collector of the transistor in the positive voltage stabilizing circuit, wherein the rectifier power supply voltage output by the multi-voltage rectifier circuit is higher than the rectifier power supply voltage output by the voltage doubler rectifier unit. When the multi-voltage rectifier circuit is connected to the input power supply, at a relatively high power output, the base voltage of the transistor can still be higher than the emitter voltage of the transistor, thereby enabling the transistor to be fully turned on, ensuring the positive voltage output set value, and avoiding the problem of high heat generation power caused by a high voltage drop between the collector and emitter of the transistor, thereby improving the stability and reliability of the voltage stabilizing circuit; at the same time, the voltage drop of the transistor is small when a relatively high power is output, which can improve the utilization rate of the rectifier power supply voltage output by the voltage doubler rectifier unit.

[0021] Example 1

[0022] Combine Figure 1 As shown, an embodiment of the utility model provides a driving power supply circuit, including a multi-voltage rectifier circuit 1 and a voltage stabilizing circuit 2 connected to the multi-voltage rectifier circuit 1, the multi-voltage rectifier circuit 1 includes a voltage doubler rectifier unit 3, the voltage stabilizing circuit 2 includes a positive voltage stabilizing circuit 4, the positive voltage stabilizing circuit 4 includes a transistor and a voltage stabilizing element, the collector of the transistor is connected to the output end of the voltage doubler rectifier unit 3, the base of the transistor is connected to the output end of the multi-voltage rectifier circuit 1 and the voltage stabilizing element, and the rectifier power supply voltage output by the multi-voltage rectifier circuit 1 is higher than the rectifier power supply voltage output by the voltage doubler rectifier unit 3.

[0023] The provided drive power supply circuit can be used to drive switching tubes such as IGBTs, SIC MOSFETs, and MOSFETs. The multi-voltage rectifier circuit 1 can achieve output voltage multiplication through a multi-stage rectification and filtering process, thereby obtaining a high-voltage DC output from an AC power supply, that is, outputting a higher rectified power supply voltage. The multi-voltage rectifier circuit 1 includes a voltage multiplier rectifier unit 3, which can also achieve voltage multiplication to obtain a high-voltage DC output.

[0024] Combine Figure 1As shown, the transistor is Q1 and the voltage stabilizing element is U1. Considering that the positive voltage stabilizing circuit 4 needs to ensure an input voltage difference between the base B and the collector C of the transistor Q1, and the collector C of the transistor Q1 is connected to the output end of the voltage doubler rectifier unit 3, and the base B of the transistor Q1 is connected to the output end of the multi-voltage rectifier circuit 1 and the voltage stabilizing element U1, the multi-voltage rectifier circuit 1 may include at least two voltage doubler rectifier units 3 to ensure that the rectified power supply voltage output by the multi-voltage rectifier circuit 1 is higher than the rectified power supply voltage output by the voltage doubler rectifier unit 3. Correspondingly, the input power supply of the voltage stabilizing element U1 is the rectified power supply voltage output by the multi-voltage rectifier circuit 1, and the voltage input of the collector C of the transistor Q1 is the rectified power supply voltage output by the voltage doubler rectifier unit 3. This ensures that the base B voltage of the transistor Q1 can still be higher than its emitter voltage when a relatively high power is output, enabling the transistor Q1 to be fully turned on. At the same time, the voltage drop of the transistor Q1 is small when a relatively high power is output, which is conducive to improving the utilization rate of the rectified power supply voltage output by the voltage doubler rectifier unit 3.

[0025] As a possible implementation, the multi-voltage rectifier circuit 1 includes two voltage-doubling rectifier units 3. Each voltage-doubling rectifier unit 3 is a 2-voltage rectifier circuit, corresponding to a 4-voltage rectifier circuit in the multi-voltage rectifier circuit 1. Using the overall output of the 4-voltage rectifier circuit as the input to the base B of transistor Q1, and using the output of one of the 2-voltage rectifier circuits as the input to the collector C of transistor Q1, ensures that the voltage at the base B of transistor Q1 is higher than the voltage at its emitter E, allowing transistor Q1 to conduct normally.

[0026] In this embodiment, the voltage stabilizing circuit 2 is a circuit that maintains a constant output voltage despite changes in input voltage, load, ambient temperature, circuit parameters, and the like. It provides a stable DC power supply and is widely applicable to various electronic devices. The positive voltage stabilizing circuit 4 is a positive power supply voltage stabilizing circuit with a positive output voltage. Positive voltage stabilizing circuit 4 can be a linear voltage stabilizing circuit, which stabilizes the output voltage by adjusting the linear amplification of transistor Q1. When the input voltage or load current changes, transistor Q1 adjusts its conduction level accordingly to maintain a constant output voltage. Using a linear voltage stabilizing circuit ensures stable output voltage, low ripple, and low noise. To ensure the efficiency of the linear voltage stabilizing circuit, the voltage difference between the base B and collector C inputs of transistor Q1 can be controlled to not exceed a certain threshold.

[0027] The transistor Q1 may be a bipolar junction transistor or a field effect transistor. In this embodiment, the transistor Q1 is an NPN bipolar junction transistor. The voltage stabilizing element U1 may be a three-terminal shunt regulator, including a TL431 adjustable precision shunt regulator.

[0028] In an embodiment of the present invention, the output end of the multi-voltage rectifier circuit 1 and the voltage stabilizing element U1 are connected to the base B of the transistor Q1 in the positive voltage stabilizing circuit 4, and the output end of the voltage doubler rectifier unit 3 is connected to the collector C of the transistor Q1 in the positive voltage stabilizing circuit 4. The rectifier power supply voltage output by the multi-voltage rectifier circuit 1 is higher than the rectifier power supply voltage output by the voltage doubler rectifier unit 3. When the multi-voltage rectifier circuit 1 is connected to the input power supply, when a relatively high power is output, the base B voltage of the transistor Q1 can still be higher than the emitter E voltage of the transistor Q1, thereby enabling the transistor Q1 to be fully turned on, ensuring the positive voltage output set value, and avoiding the problem of high heat generation power caused by a high voltage drop between the collector C and the emitter E of the transistor Q1, thereby improving the stability and reliability of the voltage stabilizing circuit 2. At the same time, when a relatively high power is output, the voltage drop of the transistor Q1 is small, which can improve the utilization rate of the rectifier power supply voltage output by the voltage doubler rectifier unit 3.

[0029] Example 2

[0030] Combine Figure 1 As shown, in this embodiment, based on the first embodiment, the voltage doubler rectifier unit 3 includes a first capacitor, a second capacitor, a first diode and a second diode;

[0031] One end of the first capacitor is connected to one end of the input power supply, and the other end of the first capacitor is connected to the cathode of the first diode and the anode of the second diode;

[0032] The cathode of the second diode is connected to one end of the second capacitor and the collector of the transistor, and the anode of the first diode and the other end of the second capacitor are connected to the other end of the input power supply.

[0033] In this embodiment, a double voltage rectifier circuit is used for illustration, wherein the first capacitor is C1, the second capacitor is C2, the first diode is D1, and the second diode is D2.

[0034] More specifically, the first capacitor C1 is connected to the input power supply, which can be provided by the front-end circuit, for example, by a transformer for DC-to-AC conversion. If provided by a transformer, when the input voltage of the transformer is in the positive and negative half-cycles respectively, the first diode D1 and the second diode D2 are alternately turned on, thereby alternately charging the first capacitor C1 and the second capacitor C2, so that the voltage of the first capacitor C1 and the second capacitor C2 gradually reaches a peak value as the input voltage rises, and the voltage input to the collector C of the transistor Q1 is twice the input voltage, that is, the collector voltage is the sum of the voltages of the first capacitor C1 and the second capacitor C2, ultimately achieving a 2x voltage rectifier output.

[0035] In this embodiment, the AC voltage is converted to a DC voltage through double-voltage rectification, and the output DC voltage has an amplitude twice that of the input AC voltage, thereby doubling the output voltage. Furthermore, the output voltage of the double-voltage rectification circuit is input to the collector of transistor Q1, creating a voltage difference with the rectified power supply voltage input to the base B of transistor Q1 by the quadruple-voltage rectification circuit. The rectified power supply voltage of the quadruple-voltage rectification circuit is higher than that of the double-voltage rectification circuit. This ensures that, even when transistor Q1 is outputting high power, the voltage at base B of transistor Q1 remains higher than the voltage at emitter E, allowing transistor Q1 to fully conduct. Furthermore, when outputting high power, the voltage drop across the transistor is minimal, improving the utilization rate of the double-voltage rectification voltage.

[0036] Example 3

[0037] Combine Figure 1 As shown, in this embodiment, based on the second embodiment, the multiplier voltage rectifier circuit 1 further includes a third capacitor, a fourth capacitor, a third diode and a fourth diode;

[0038] One end of the third capacitor is connected to the cathode of the first diode and the anode of the second diode, the other end of the third capacitor is connected to the cathode of the third diode and the anode of the fourth diode, and the anode of the third diode is connected to the cathode of the second diode;

[0039] One end of the fourth capacitor is connected to the cathode of the fourth diode, and the cathode of the fourth diode is connected to the base of the transistor. The other end of the fourth capacitor is connected to the input power supply.

[0040] Combine Figure 1 As shown, the third capacitor is C3, the fourth capacitor is C4, the third diode is D3, and the fourth diode is D4. The above-mentioned multi-voltage rectifier circuit 1 is a 4-voltage rectifier circuit, which includes the above-mentioned 2-voltage rectifier circuit and further includes a third capacitor C3, a fourth capacitor C4, a third diode D3, and a fourth diode D4.

[0041] Specifically, one end of the third capacitor C3 is connected to the cathode of the first diode D1 and the anode of the second diode D2, the other end of the third capacitor C3 is connected to the cathode of the third diode D3 and the anode of the fourth diode D4, the anode of the third diode D3 is connected to the cathode of the second diode D2, one end of the fourth capacitor C4 is connected to the cathode of the fourth diode D4, and the cathode of the fourth diode D4 is connected to the base of the transistor Q1. When the input voltage is in the positive and negative half-cycles of the first cycle, the first diode D1 and the second diode D2 are alternately turned on, thereby charging the first capacitor C1 and the second capacitor C2 in sequence. When the output voltage reaches the positive and negative half-cycles of the second cycle, the third diode D3 and the fourth diode D4 are controlled to be alternately turned on, thereby charging the third capacitor C3 and the fourth capacitor C4 in sequence. The cathode of the fourth diode is connected to the base B of the transistor Q1. Therefore, the voltage at the base B of the transistor Q1 is the sum of the voltages of the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4, ultimately achieving a 4-fold voltage rectification output.

[0042] In this embodiment, the unidirectional conductivity of the diode and the periodic alternating input characteristics of the input voltage are utilized to control the charging of different capacitors, ultimately achieving voltage doubling rectification. Furthermore, the voltage input to the collector C of transistor Q1 is the rectifier power supply voltage of the 2x voltage rectifier circuit, and the voltage input to the base B of transistor Q1 is the rectifier power supply voltage of the 4x voltage rectifier circuit, where the 4x voltage rectifier power supply voltage is higher than the 2x voltage rectifier power supply voltage. A voltage stabilizing element U1 is connected to the base B of transistor Q1, so that when a high power output is achieved, the voltage at the base B of transistor Q1 can still be higher than the voltage at the emitter E, ensuring that transistor Q1 is fully conductive. Furthermore, when a high power output is achieved, the voltage drop across the transistor is small, thereby improving the utilization rate of the 2x voltage rectifier voltage.

[0043] Example 4

[0044] Combine Figure 1 As shown, in this embodiment, based on embodiment three, the positive voltage stabilizing circuit 4 further includes a feedback control circuit and a fifth capacitor, the feedback control circuit is connected between the base and the emitter of the transistor, one end of the fifth capacitor is connected to the emitter of the transistor, the emitter of the transistor is connected to the positive electrode of the output power supply, and the other end of the fifth capacitor is connected to the reference ground.

[0045] The positive voltage stabilization circuit 4 may include a feedback control circuit that can be used to control the transistor Q1 to stabilize the positive voltage. The feedback control circuit includes a first resistor, a second resistor, a third resistor, and a voltage stabilization element. One end of the first resistor is connected to the cathode of the fourth diode, and the other end of the first resistor is connected to the base of the transistor. One end of the second resistor is connected to the emitter of the transistor, and the other end of the second resistor is connected to one end of the third resistor and the reference end of the voltage stabilization element. The other end of the third resistor is connected to a reference ground. The positive electrode of the voltage stabilization element is connected to the negative voltage stabilization circuit and the reference ground, and the negative electrode of the voltage stabilization element is connected to the base of the transistor.

[0046] Combine Figure 1 As shown, the first resistor is R1, the second resistor is R2, the third resistor is R3, and the fifth capacitor is C5. Connecting the first resistor R1 between the cathode of the fourth diode D4 and the base B of the transistor Q1 achieves voltage division and current limiting. By limiting the current in the base B of the transistor Q1, it prevents damage to the transistor Q1 due to excessive current in the base B of the transistor Q1. Furthermore, the effects of factors such as power supply voltage fluctuations or temperature changes on the current in the base B of the transistor Q1 can be reduced, thereby helping to stabilize the transistor's operating point. The voltage stabilizing element U1 can integrate a precise reference voltage source, a feedback comparator, and an output circuit. The reference voltage source maintains high stability through internal circuitry and serves as a reference voltage. The feedback comparator is used to compare the input voltage (the voltage at the reference terminal) of the voltage stabilizing element U1 with the reference voltage. The output circuit includes a power transistor for controlling the stability of the output voltage.

[0047] More specifically, the reference terminal of voltage stabilizing element U1 is connected to the input voltage source (emitter E of transistor Q1) via a voltage divider network formed by a second resistor R2 and a third resistor R3. The voltage divider network is used to set the reference voltage of voltage stabilizing element U1, then compares the reference voltage with an internal reference voltage and outputs a corresponding voltage based on the comparison result. As a possible implementation, if voltage stabilizing element U1 is a TL431 voltage regulator, when the voltage at the reference terminal is higher than 2.5V, the feedback comparator outputs a high-level signal, turning on the power transistor in the output circuit, thereby lowering the voltage between the cathode and anode of the TL431 regulator. This reduces the output voltage and, in turn, the voltage divided by the voltage divider network, resulting in a lower reference terminal voltage. When the reference terminal voltage is lower than 2.5V, the feedback comparator outputs a low-level signal, turning off the power transistor in the output circuit, and the output voltage is no longer lowered. This process repeats continuously, forming a closed-loop feedback system that stabilizes the reference terminal voltage of voltage stabilizing element U1 at approximately 2.5V, thereby achieving voltage regulation.

[0048] As a possible implementation, the voltage at the reference terminal of the voltage stabilizing element U1 can be adjusted by changing the resistance values ​​of the second resistor R2 and the third resistor R3, thereby setting the output voltage of the voltage stabilizing element U1. The output voltage of the TL431 voltage regulator can be adjusted anywhere between 2.5V and 36V. Of course, if the voltage stabilizing element U1 is another type of voltage regulator, the corresponding output voltage can be adjusted within the allowable range.

[0049] More specifically, connecting the second resistor R2 and the third resistor R3 between the emitter E of transistor Q1 and the reference ground can also provide negative feedback, stabilizing the circuit's operating point, reducing nonlinear distortion, and improving circuit stability and reliability. The fifth capacitor C5 provides voltage stabilization and filtering, stabilizing the positive voltage output from the emitter E of transistor Q1, thereby ensuring that the positive electrode (+VCC) of the output power supply receives a stable, amplified voltage for use by subsequent circuits or loads.

[0050] In this embodiment, the positive voltage stabilization circuit 4 achieves input voltage stabilization of the base B of the transistor Q1 by utilizing the voltage stabilization element U1; a voltage divider network is formed by the second resistor R2 and the third resistor R3 to achieve voltage regulation of the reference end of the voltage stabilization element U1 and stabilize the operating point of the circuit, thereby reducing nonlinear distortion and improving the stability and reliability of the positive voltage output; and voltage stabilization and filtering are performed by the fifth capacitor C5 to enhance the stability of the positive voltage output.

[0051] Example 5

[0052] Combine Figure 1 As shown, in this embodiment, based on Example 4, the voltage stabilizing circuit 2 also includes a negative voltage stabilizing circuit 5 connected to the positive voltage stabilizing circuit 4, the negative voltage stabilizing circuit 5 includes a voltage stabilizing diode and a sixth capacitor connected in parallel, the negative electrode of the voltage stabilizing diode and one end of the sixth capacitor are connected to the reference ground, and the positive electrode of the voltage stabilizing diode and the other end of the sixth capacitor are connected to the negative electrode of the output power supply.

[0053] Specifically, the driving power supply circuit includes a positive voltage output and a negative voltage output. Therefore, the voltage stabilizing circuit 2 also includes a negative voltage stabilizing circuit 5. The negative voltage stabilizing circuit 5 is a negative power supply voltage stabilizing circuit with a negative output voltage. It can provide a stable negative voltage output to ensure the normal operation of the circuit, and the polarity of the output voltage is opposite to that of the positive voltage stabilizing circuit 4.

[0054] Combine Figure 1As shown, the negative voltage stabilization circuit 5 includes a voltage regulator diode D5 and a sixth capacitor C6. The sixth capacitor C6 can be used to perform voltage stabilization and filtering on the negative voltage stabilization circuit 5. The positive electrode of the voltage regulator diode D5 is connected to the negative electrode VCC- of the output power supply, and the negative electrode of the voltage regulator diode D5 is connected to the reference ground. The voltage regulator diode D5 is in a reverse biased state. When the voltage applied across the voltage regulator diode D5 exceeds its breakdown voltage, the voltage regulator diode D5 will undergo reverse breakdown. In the reverse breakdown state, the resistance of the voltage regulator diode D5 drops sharply, allowing a large amount of current to pass. However, at this time, the voltage across the voltage regulator diode D5 remains almost constant and no longer increases significantly with increasing current. This characteristic enables the voltage regulator diode D5 to offset fluctuations in the input voltage within a certain range, thereby stabilizing the output negative voltage.

[0055] In this embodiment, the sixth capacitor C6 is used for voltage stabilization and filtering, thereby enhancing the stability of the negative voltage output; and the reverse bias characteristic of the voltage regulator D5 is utilized to ensure that the fluctuation of the input voltage is offset within a certain range, thereby stabilizing the output of the negative voltage.

[0056] In order to explain the effect achieved by this application more clearly, Figure 2 As shown, Figure 2 This is a schematic diagram of the actual circuit voltage test results. Figure 2 As the electronic load power increases, the 4x rectified voltage, the 2x rectified voltage, and the voltage drop of transistor Q1 all decrease, with the voltage drop of transistor Q1 reaching as low as 0V. However, the positive and negative driving voltages remain stable even with increasing electronic load power and multi-fold rectification, outputting stable positive and negative voltages to the subsequent circuits.

[0057] Example 6

[0058] Combine Figure 3 As shown, in this embodiment, a driving system is provided, including a switching circuit 6, a transformer 7, an isolation driving circuit 9, a switching tube 10 and a driving power supply circuit of the above embodiment; the input end of the switching circuit 6 is connected to the external power supply, the output end of the switching circuit 6 is connected to the input end of the transformer 7, the output end of the transformer 7 is connected to the input end of the driving power supply circuit 8, the output end of the driving power supply circuit 8 is connected to the input end of the isolation driving circuit 9, and the output end of the isolation driving circuit 9 is connected to the switching tube 10.

[0059] In this embodiment, after DC power is input, the aforementioned switching circuit 6 and transformer 7 form the primary power circuit, which can be implemented using an LLC circuit. The secondary side of transformer 7 is rectified and the positive and negative voltages are stabilized using the driver power circuit 8 provided in any of the aforementioned embodiments before being supplied to an isolated driver circuit 9. The isolated driver circuit 9 controls the on / off state of the switch 10 based on the input control signal, ultimately achieving the power on / off function. The switch 10 can be a power switch 10 such as a SIMOSFET, SIC MOSFET, or SIIGBT.

[0060] Among them, the driving power supply circuit 8 can ensure that the base B voltage of the transistor Q1 can still be higher than the emitter E voltage of the transistor Q1 when the power output is relatively high, thereby enabling the transistor Q1 to be fully turned on, ensuring the positive voltage output set value, and avoiding the problem of high heat generation power caused by the high voltage drop between the collector C and the emitter E of the transistor Q1, thereby improving the stability and reliability of the voltage stabilizing circuit 2. At the same time, the voltage drop of the transistor Q1 is small when the power output is relatively high, which can improve the utilization rate of the rectified power supply voltage output by the voltage doubler rectifier unit 3. In this regard, the driving system provided in this embodiment can also implement any of the above-mentioned specific embodiments and achieve the corresponding technical effects, and will not be repeated here.

[0061] In an embodiment of the present utility model, by connecting the output end of the multi-voltage rectifier circuit 1 and the voltage stabilizing element U1 to the base B of the transistor Q1 in the positive voltage stabilizing circuit 4, and connecting the output end of the voltage doubler rectifier unit 3 to the collector C of the transistor Q1 in the positive voltage stabilizing circuit 4, when the multi-voltage rectifier circuit 1 is connected to the input power supply, at a relatively high power output, the base B voltage of the transistor Q1 can still be higher than the emitter E voltage of the transistor Q1, thereby enabling the transistor Q1 to be fully turned on, ensuring the positive voltage output set value, and avoiding the problem of high heat generation power caused by a high voltage drop between the collector C and the emitter E of the transistor Q1, thereby improving the stability and reliability of the voltage stabilizing circuit 2; at the same time, the voltage drop of the transistor Q1 is small when outputting a relatively high power, which can improve the utilization rate of the rectifier power supply voltage output by the voltage doubler rectifier unit 3. The input voltage of the base B of the transistor Q1 is stabilized by utilizing the voltage stabilizing element U1; a voltage divider network is formed by the second resistor R2 and the third resistor R3 to achieve voltage regulation at the reference end of the voltage stabilizing element U1 and stabilize the operating point of the circuit, thereby reducing nonlinear distortion and improving the stability and reliability of the positive voltage output; voltage stabilization and filtering are performed by the fifth capacitor C5 to enhance the stability of the positive voltage output; voltage stabilization and filtering are performed by the sixth capacitor C6 to enhance the stability of the negative voltage output; based on the reverse bias characteristic of the voltage stabilizing diode D5, it can ensure that fluctuations in the input voltage are offset within a certain range, thereby stabilizing the output of the negative voltage.

[0062] It should be understood that the terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. Mention of "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present invention. Multiple refers to two or more. And / or is simply a variable relationship that describes associated objects, indicating that three relationships may exist. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A driving power supply circuit, characterized in that: It includes a multi-voltage rectifier circuit and a voltage stabilizing circuit connected to the multi-voltage rectifier circuit, the multi-voltage rectifier circuit includes a voltage doubler rectifier unit, the voltage stabilizing circuit includes a positive voltage stabilizing circuit, the positive voltage stabilizing circuit includes a transistor and a voltage stabilizing element, the collector of the transistor is connected to the output end of the voltage doubler rectifier unit, the base of the transistor is connected to the output end of the multi-voltage rectifier circuit and the voltage stabilizing element, and the rectifier power supply voltage output by the multi-voltage rectifier circuit is higher than the rectifier power supply voltage output by the voltage doubler rectifier unit.

2. A driving power supply circuit according to claim 1, characterized in that: The voltage doubler rectifier unit includes a first capacitor, a second capacitor, a first diode and a second diode; One end of the first capacitor is connected to one end of the input power supply, and the other end of the first capacitor is connected to the cathode of the first diode and the anode of the second diode; The cathode of the second diode is connected to one end of the second capacitor and the collector of the transistor, and the anode of the first diode and the other end of the second capacitor are connected to the other end of the input power supply.

3. A driving power supply circuit according to claim 2, characterized in that: The multi-voltage rectifier circuit further includes a third capacitor, a fourth capacitor, a third diode and a fourth diode; One end of the third capacitor is connected to the cathode of the first diode and the anode of the second diode, the other end of the third capacitor is connected to the cathode of the third diode and the anode of the fourth diode, and the anode of the third diode is connected to the cathode of the second diode; One end of the fourth capacitor is connected to the cathode of the fourth diode, and the cathode of the fourth diode is connected to the base of the transistor. The other end of the fourth capacitor is connected to the other end of the input power supply.

4. A driving power supply circuit according to claim 3, characterized in that: The positive voltage stabilization circuit also includes a feedback control circuit and a fifth capacitor. The feedback control circuit is connected between the base and the emitter of the transistor. One end of the fifth capacitor is connected to the emitter of the transistor. The emitter of the transistor is connected to the positive electrode of the output power supply. The other end of the fifth capacitor is connected to the reference ground.

5. A driving power supply circuit according to claim 4, characterized in that: The feedback control circuit includes a first resistor, a second resistor, a third resistor and the voltage stabilizing element; One end of the first resistor is connected to the cathode of the fourth diode, and the other end of the first resistor is connected to the base of the transistor; One end of the second resistor is connected to the emitter of the transistor, the other end of the second resistor is connected to one end of the third resistor and the reference end of the voltage stabilizing element, and the other end of the third resistor is connected to the reference ground; The positive electrode of the voltage stabilizing element is connected to the negative voltage stabilizing circuit and the reference ground, and the negative electrode of the voltage stabilizing element is connected to the base of the transistor.

6. A driving power supply circuit according to claim 4, characterized in that: The voltage stabilizing circuit also includes a negative voltage stabilizing circuit connected to the positive voltage stabilizing circuit, and the negative voltage stabilizing circuit includes a voltage stabilizing diode and a sixth capacitor connected in parallel, the negative electrode of the voltage stabilizing diode and one end of the sixth capacitor are connected to the reference ground, and the positive electrode of the voltage stabilizing diode and the other end of the sixth capacitor are connected to the negative electrode of the output power supply.

7. The driving power supply circuit according to claim 5, characterized in that: The voltage stabilizing element includes a three-terminal integrated voltage stabilizer.

8. A driving power circuit according to any one of claims 1 to 7, characterized in that: The voltage-doubling rectifier unit includes a double-voltage rectifier unit, and the multi-voltage rectifier circuit includes a quadruple-voltage rectifier circuit.

9. A drive system, characterized in that: It comprises a switching circuit, a transformer, an isolation drive circuit, a switching tube, and a driving power supply circuit as claimed in any one of claims 1 to 8; The input end of the switching circuit is connected to an external power supply, the output end of the switching circuit is connected to the input end of the transformer, the output end of the transformer is connected to the input end of the driving power circuit, the output end of the driving power circuit is connected to the input end of the isolation driving circuit, and the output end of the isolation driving circuit is connected to the switching tube.

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